Question: What position did Robert Walpole cover starting from 1721-4-4 onward?
Paraphrase: Give me the position that Robert Walpole covered, starting 1721-4-4.
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q104190 p:P39 ?s . ?s ps:P39 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1721')) }